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According to your description, please follow the following 5 points to rule out:
A, line problems First check the home line, see whether the house connector is connected, whether the line passes through any source of interference, such as air conditioning, refrigerator, TV, etc., and try to keep a certain distance from these power equipment. You can also replace the indoor lines with network cables that are more resistant to interference.
Second, the network card problem The network card is generally PCI card or on-board network card, the choice must be to choose a better quality, otherwise it may cause the Internet quality is not good. 10M or 10M/100M adaptive network card can be. In addition, many machines *** enjoy Internet access, the use of dual network card, which is also caused by the same conflict of concern, then, should be pulled up to connect to the LAN or other computer network card, only connect to the ADSL network card to test the Internet, if the failure to return to normal, and then check the two network card there is no conflict.
Three, ADSL MODEM or network card setup problems Now MODEM generally has two working modes, one is the normal mode using dial-up software, and the other is the automatic dialing routing mode. In the normal mode of operation, do not need to set up the MODEM, use the default can be. Routing mode, on the other hand, requires settings. The MODEM comes with its own flash memory, so you can deposit account and password box settings for power-on auto dialing. This method is most commonly used when the IP address of the ADSL Modem is set wrongly, or the DNS server is set wrongly. Because for ADSL virtual dialing users, there is no need to set the IP address, it can be assigned automatically, and the TCP/IP gateway usually doesn't need to be set. However, DNS settings must be set correctly, DNS address can be obtained from the local telecommunications department. In addition, the TCP/IP settings are most likely to cause the situation of not being able to browse the web, generally set to automatically obtain an IP address, but the DNS must be filled in. If you suspect that the splitter is bad or the ADSL Modem is bad, try to connect the external line directly to the ADSL Modem without using the splitter. the connection line between the splitter and the ADSL Modem shouldn't be too long, or else it can't be synchronized. To rule out the above, just restart the ADSL Modem to solve the synchronization problem.
Fifth, the operating system, virus problems In addition to the above mentioned line conditions, there are computer system problems. For example, the Legend Killer causes LAN dropouts. The problem occurs in a large area of the country, the virus on the host agent and router agent cybercafe (LAN) will have an impact.
Anhui Telecom is at your service, and I hope my answer will be accepted. I wish you a happy life!